/Engine/Source/Editor/EditorWidgets/Public/SAssetDropTarget.h
Called when valid assets are dropped
typedef TBaseDelegate_TwoParams< void, const [FDragDropEvent](API\Runtime\SlateCore\Input\FDragDropEvent) &, [TArrayView](API\Runtime\Core\Containers\TArrayView)< [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) > > FOnAssetsDropped